Dasflugmodele, I too have the Guillow's P40 kit and plan to electrify it some day.

The Tommy uses a GWS IPS DXA motor, 8 cells of 370mAH NiMH, a Pixie 7 speed control, and 3 Cirrus CS10 servos. Prop is an APC 9x6 slowflyer clipped to about 8.5"

The Sopwith Camel is a bit bigger than the Tommy, closer to the Stearman in size, so it will need a bigger motor than the Scout.

I think they called those Joe Ott kits "Ott-O-Former" or something like that. I've never built one, got scared away by the promise of a very heavy model that would be very unlikely to ever fly. Now that would be amazing if someone really did get one of those to fly.